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Financial Instruments - Summary of Maturity Analysis of Trade Receivables (Detail) - Credit risk [member] - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables | $ 4,163 | $ 1,140
Less than 30 days past billing date [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables | $ 3,980 | 1,020
Less than 30 days past billing date [member] | Bottom of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 0.00% |
Less than 30 days past billing date [member] | Top of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 3.00% |
31 to 60 days past billing date [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables | $ 136 | 85
31 to 60 days past billing date [member] | Bottom of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 0.00% |
31 to 60 days past billing date [member] | Top of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 5.00% |
61 to 90 days past billing date [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables |  | $ 35
61 to 90 days past billing date [member] | Bottom of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 0.00% |
61 to 90 days past billing date [member] | Top of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 8.00% |
91 to 120 days past billing date [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables | $ 19 |
91 to 120 days past billing date [member] | Bottom of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 0.00% |
91 to 120 days past billing date [member] | Top of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 12.00% |
Over 120 days past billing date [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Analysis of the age of trade receivables | $ 28 |
Over 120 days past billing date [member] | Bottom of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 0.00% |
Over 120 days past billing date [member] | Top of Range [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Expected Credit Loss Rate | 18.00% |

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